Electric incandescent lamp.



A. S. KNIGHT.

ELECTRIC INGANDBSGENT LAMP.

APPLICATION FILED MAY 16, 1910.

- 1,104,807. Patented July 28,191L

INVENTOR ATTdRNEY WlTN ESSES:

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stray it a? as ."iria r o rs i a Iih CATt-TFDESGENET mosses.

Specification of letters Patent.

Patented July 28, T1914.

npplicationfilec 16, 1910. Serial 2-70. 561,5?7.

To all whom it may concern Be it known that I, ARTHUR S. KNIGHT, a sub ect of the King of Great Britain, and a resident of Newarli, in the county of Essex and State-of New Jersey, have'invented a new ant useful improvement in Electric inc; "n'lescent Lamps, of which the following specification.

My invention relates, to electric icannt lamps and particularly tolamps 1g tubular bulbs or casings and straight a merits stretched between the'ends then-inf.

The object of my invention is to provide a. lamp of the character indicated inwhich it "ten or other lowa'esistance install til amcnts are employed and which :may be ,1 onnectcd singly and directly to an ordinary commercial ligl'iting circuit.

Heretofore, when tungsten and other lowresistance filaments have been used in tubular incandescent lamps, it has been necessary to either reduce the voltage ofthe ordinary commercial lighting circuit for application to such lamps, or to connect a plurality of lamps in series to-the circuit. The present invention provides a tubular lamp having a low-resistance filament which is adapted to' be connected to the ordinary commercial lighting" circuit.

-Fignre 1 of the accompanying drawing is a side Yicw of a lamp constructed in accord ance with the present invention. Figs. 2 and 3 are similar views of modified forms of the lamp, and Figsfei, 5 and 6 are enlarged perspective views of certain of the details of the lamps illustrated in Figs. 1, 2 and The lamp comprises a tubular bulb or casing 1 having protecting end caps 2 and terminal leads or wires 4- and that project into opposite ends of the bulb. Suspended Within the bulb, near its ends, are glass or other insulating beads or bodies 6 and 7 in which the Vertic'cs of V-shapcd or rcversely bent anchor Wires 8, 9, 10 and 11 are securely embedded, the ends of the said Wires being looped or hooked, as desired, for connection to the filaments. One end of the wire 8, that is carried by the bead or insulating body 6, is connected. to the leading-in wire 4, and one end of the wire 11, that is carried by the head or insulating body 7 at the opposite end of the lamp, is connected to helical tension spring 12 which is interposed between the said wire and the ieadmgin order tha the spring 12 may not be required to carry all the current of the lamp, a low-resistance conductingshunt 13 1S connected between the leadingl'dn wire 5 and the wire 11. Stretched between the remaining extremities of the anchor wires-8, 9, l0 and 11 are three straight filaments 14L. and lb which are so connected to the said wires that c nt may pass from one of the leading-in wires, through the filaments and anchor wires in series to the-leading-in wire at the other extremity of tie lamp. There being three filaments in the lamp, instead of one, as has been heretofore customary, the resistance of the lamp is approximately 70 roe times that of a lamp having a single ii ament. and may, consequently, be so proportioned that the lamp may be connected to a comparatively high-potential circuit. such as the ordinary commercial lighting 75, circuit,

The lamp of Fig. 2 is similar, in most respects, to that of Fig. 1, but, in order to facilitate the insertion of the filaments andtheir supporting system into the bulbs, a comparatively rigid wire or rod 18, which is connected to the head or insulating body 6 at one end of the lamp, extends substantially the whole length of the lamp and is connected to the leading-in wire 5 at the opposite end, the spring 12 being interposed between a loop at one end of the saidrod and the anchor wi-rc ll. By reason of this construction, the filaments may be mounted upon their supports outside of the lamp, and the parts, as thus assembled, may then be inserted into the bulband connections be made between the terminals of the system and the leading-in wires. The Wire or rod 18 may be composed of metal or of glass, or of any other suitable material. though it is preferably composed of metal, so that it may serve to conduct current from the leading-in wire 5 to the members and 19. In the lamps shown, the rods 18 are composed of metal. If the rods are composed of glass, it is obviously necessary to employ an additional connection between the member 520 and the leading-in wire 5.

In Fig. 2,11. different form of shunt for the spring 12 is shown, this shunt compristwo members 19 and 20 that are hinged together, the extremity of the member 19 being coiled about the laterally bent looped end of the member 20, substantially as stretched between the remaining conducting members.

2. An incandescent lamp comprising a tubular shell having terminal wires pro jecting into its. opposite ends, insulating bodies carrying reversely bent conducting members, certain of which are connected to .the terminal wires, a plurality of filaments stretched between the remaining conducting members, and resilient means interposed between one of the leading-in-wires and the corresponding conducting member.

3. An incandescent lamp comprising a tubular shell having terminal wires projecting into its opposite ends, insulating bodies carrying reversely bent conducting members, certain of which are connected to the terminal wires, a plurality of filaments stretched between the remaining conducting members, a rigid member connecting the insulating body at one end of the lamp to the leadingdnwire at the other end.

42. An incandescent lamp comprising a tubular shell having terminal wires projecting into its opposite ends, insulating bodies carrying reversely bent conducting members, certain of which are connected to the terminal wires, a plurality of filaments stretched between the remaining conducting members, resilient means interposed between one of the leading-in wires and the corre sponding conducting member, and a rigid member connecting the insulating body at one end of the lamp to the leading-in wire the'other end.

5. An incandescent lamp comprising a tubular shell having terminal members projecting into its opposite ends, a rod within the shell extending longitudinally thereof, insulating bodies at opposite ends of the rod, resilient means interposed between one of said bodies and said rod, filament supporting members carried by the said bodies, and a filament stretched between the said supporting members.

(3. An incandescent lamp comprising a 'tubular shell having terminal wires projecting into its opposite ends, a rod. within the shell extending longitudinally thereof and connected at one end 'to one of the terminal wires, insulating bodies supported at oppo- I site ends of the rod, anchor wires carried .;by the said bodies, one of which is connected to the remaining terminal wire, and filaments stretched between the anchor wires.

7. An incandescent lamp comprising a tubular shell having terminal wires projecting into its opposite ends, a rod within the shell extending longitudinally thereof, insulating bodies supported at opposite ends of the rod, anchor wires carried by the insulating bodies, filaments stretched between the anchor wires, and connections between the filaments and the terminal wires.

8. An incandescent lamp comprising a tubular shell having leading-in wires projecting into its opposite ends, a plurality of substantially parallel separate filaments disposed longitudinally within the shell and connections between the filaments and the leading-in wires.

.9. An incandescent lamp comprising a tubular shell having leading-in wires projccting into its opposite ends, a plurality of substantially parallel series-connected separate filaments disposed lon 'itudinally within the shell, and connections between the ends of the filaments and the leading-in wires.

in tcstimimy whereof, I have hereunto subscribed my name this second day of May,

Jill-THUR S. KNIGHT. ll'itncsses GZLUILIJS E. Kenny, A. Youxcnonx. 

